Treat rusted spots in your bed correctly. If you've removed an old drop-in liner, you probably have some rust to deal with. Just wire brush to remove loose scale and scuff sand the surrounding paint. Apply 2 coats of Chassis Saver directly over the rust. Install Monstaliner when dry. Gloss Black is also used on frames and automotive components as a stand alone coating or as a base coat under any quality industrial or automotive top coat. Chassis Saver Stops Rust Permanently! [1 Quart]